I think it's this one, maybe a little too clean looking for the time period, but cool nonetheless.

I'm glad we didn't get that. It's way too similar to future Starfleet designs. That's also why I'm not a fan of the secondary hull refit they did for Ships of the Line.

By some arguments, the NX is close to a future SF design, the Akira.

It's not a bad thing to see certain design ideas reused either way.

^ This one has the proportions of an Ambassador class with some of the lines of a Sovereign class. Nice looking ship, but I'm OK with the NX being what it was.

__________________
Rimmer, on what period of history to live in-
“Well, It’d be the 19th century for me, one of Napoleon’s marshals.
The chance to march across Europe with the greatest general of all time and kill Belgians” - (White Hole).